Railway switch operating apparatus



May 7, 1935. w, c. MGWHIRTER ET AL 2,000,860

RILWAY lSWITCl OPERATING APPARATUS 5 sheets-shet 1 Filed July ll, 1955 May 7, 1935. w. c. McwHlRTER ET A1. 2,000,860

I RAILWAY SWITCH OPERATING APPARATUS Filed Juli,v 11, 1935 5 sheets-,sheet 2 /7 GST@ .XN @EN www Q May 7, 10935.

RAILWAY SWITCH OPERATING APPARATUS Filed July 11, 1953 5 SheetsSheet 3 IN VENT ORS By ,f5/Edwin aufge.

THEIR ATTORNEY Patented 1935 vour invenmqn reiateswranwy switchioirating" apparatus, and particularly `toimprovements in e apparatus; ofthe type described; and 'clai'rned` ing-Letters` Patent ,ofthe United QStates ,No. y

1,791,799, granted. togJ, P, Coleman, on February We winl desenbesveriforzs of apparatsei;

bodying our invention,` fand willv` then ',point'gout the novel features thereofgin; claims;` 1 the-accompanyingdrawings,:Fig 1 iisa longitudinal vertical sectional; View showing Onej form v of ',apparatus; embodying our `inventionL lrFig.; 2fis a1 top plan view; of theapparatusshowninFig;I," f with `the covers for thel casing Vremoved-tobetter illustrate the coifistruction` of the ,mechanisrn; Fig.Y ,3; is a horizontal sectional `view of, the; apparatus shown.; in Fig; 11; taken substantially on` the "line IIIj-III of` Fig,` 1. g' Fig'. 4 is a view similarto Fig.` 1 illustrating thepositionsthat certain ofjthe parts shovfnjn Fig. ,1 assume when the apparatus is in condition tobeoperatedmanually. Fg.,=5 is an enlarged sectional ViewI of the lock-unit L shown in Fig.,2,j, yFigs.-6 and '7 aresectionalgviews taken on thelines VI-VI and Y1I--YIL respectively-ofu 5. Fig. 8 is an enlargedytopv planview'of the cover II, shown; l'ig.1,9A is. agsectional means of-boltsvgand'l extending "downwardly y viewftaken on rthe line 1X1-1xV of, pigra Fig.l

l0 is an enlarged detail view-,of`r certa1,.offthe partsin the positionsinv which they areslugitvriA Fig;1. H

similar parts in each of the'several Vviewsz 1 Y Rgeferringirst to Figs. 1,` toj,3;;,vn, -ilsivoi'the Y switch apparatus embodying ourinventionvis here shown as inclcsed in a casingA'made up'jofithree castings I-,f2and 3 held together'bybolts land Securedtogthe, underside of; the casing ,Alby

' y throughsuitableholesin,the castingsflfand 2, re'- spectively, as best seen. in Fig,` `1,5l arejwoplates Y 8 and 9, provided withholes Ill-throughfwhich lag screws or otherfastening devices vmaybczpassd forsecuring thecasing to a suitablesuppQrtsuch as the ties of a.- railwaytrack. Castingv -21is formed with two compartments v2a and 2,1?00mpartment 2EL being closedrby a removable covenl I and compartmentzZb-being closed b y a removable'cover'12.5, .i As best seen Fig, 3, the 'casting' Ilis formed with two ,parallel cylinders, I3, 1 3"y Whi'chxare" closed" at their outer.4 endsbymean'soff cylinder heads I4?, I-ib, andwhich c'cnmiunicateatgtheir i innerlends With the ,compartment 2'?, Vof casting# mounted for reciprocationin' the `cylinders; I3?, I3?J and are `attached' to .theend ,ofVv rack bars? IJs, I 1b` which :extend through theV openings; l5?, f 15b intoA the compartment 2P of., theV casting 2 Afor infv 'termeshing engagement with the,oppositegfsides` Oia gear wheeliagg'l'hegearJwheel -I8"iskey`ed to a vertically extending, jackshaft-rI 5,; :the .lower reference characters @referV tosixnilar ,sans

formed in a plate-22 attachf-:digt,othecastingl"` ."A crank 23fisf =.pr0vided itheflowersenidofthefshaft I9, and this crankiparriesa rollelfllwhich.Y co- Y f ,operatesgwithf asuitabler slotv ,25extending' trans-w witch;` operating rod lathensimilar device notshownginthe drawings.

;` Fluid pessue.-j; may bfe :admitted tothe; inte Mb, and which 'communicate`r withlpipeslY-Z', -28,1 throughtvalves ,2 9,, i2 ,913, asbestvseen in `Figs'.1"and 13 :Whenthe:valvestoccupylthe,positionsshown inv `Fig; 1 fcommunicationzis establishedj between the pipes;28*1122811,1:and4 the-iinteriors `of the cylinders,

but ,f'v'vherrv ,they K are;h rotatedirOxn the positions l lfc'ounter-clockwise@ directimgrth'e, i cylinders, *are Y fdisk :onn'ectedf from .gthej; pipes s, ,281%112811 and s Y are connected with "atmosphere ythrough vent plugs fillet,A-` 30h. the mormjalgoperation y of the apparatus, `the valves 299,529,131 occupy;;their open positions in .which :they are :illustrated Fig. :1, `andxfluid,pressurei from theV source yis selectively admitted to "the cylinders 1 |35: yI 3b through suit-L able- .valvesf v( not shown);

provided 1in the pipes in fthe, cylinders that iwhen' rone ,piston atY the,` n endof itsfstroke in onedirection; the other :piston vwill beat the 'end ofits stroke in4 thel .otherfdireceg tion. :'fItuWll bev apparent;v therefore'fthatif Afluid' pressure is admittedto I'cylinderS |311 ,'when'ithe f v :inlar'cloekwis'e direction, andhencemovingfrack 1 Y bar II'iL and piston-I Itowardthe lefty, Similarly,

if udpressureis admittedltoxcylinderfl3,"when I the parts are in the,lastignamed,.pcsitions,'pistonV IIe-z will move ,rack `baruIla ltoward-theright, 7

.thereby:fr otatingf:.geary wheel vIII- ,inv a "counter-V jclockwise direction; and hencemoving, rack v,bar

,I Ib andfp'iston .I6*',toward;,the left.` fItffollows', that; ,thef-'gear wheel I I8 and*v jackshaft AIII can be given- V, either 5 a {counter-clockwise .or clockwise motion by' admitting uidrpres'sure rto the proper f itmmtedgin1;fcioclmfise directmmtheswitch oper'- l 5K5 y ating;r rod'fZSfis, moved'downwardlyr asv viewed. in Figs fand- 3;,, bythe f'roller,l -24 ong-crank 23, and

:,conversely';whenfthe's-shaft rotated'intheqopy positedirection, vthe switch operating `rod ismoved Fluid pressure*` rnayl` be supplied' to,A

1o If. and isfadaptedftobeconnectedat; itsfouter ,ends

28a and 28h selectivelyfor the control of the apparatus lby any suitable means forming no part ofour; present invention and thereforenot shownV in the drawings. e

Y The pistons Ilia, Hb are formed with centrally, disposed rearwardly extending plungers 3|,l 3Ib' which are adaptedto enter-.axially disposed.cy. lindricalbores 32a, 329 provided in the cylinder gers 4l!EL with their associated fixed contact nheads I4, |411, as the piston'sfapproach'the limits of their strokes. The bore's'132., 32bcommunicate directly with the inlet'passag'es 213,' 2lb4 and -`it will be apparent, therefore, that vasfrsooncV as the end of the plunger enters the corresponding bore,' the fluid which remains in the cylindervv between the piston and the cylinder head is' t'rappedvin 4Vthe cylinder. As a result, during the remainder 'of the strokeV of the piston, thistrapped airbe- 'comes compressed, thereby cushioningthe action of the-entire apparatus. i l y The right-'hand ends oftheracl;'barsl Il); l'lb, that is'to say', the-endslopposite to'fth'e lpistons AIt, I6b are providdwith cylindrical guides 33a, 33br which-are slid'ablyA mounted infcylindri'calv guideways 345,-.: 34V formed'v inffzthe lower lpart of thecasting 2. 'I'hefrightehand ends of thef'rack bars are alsoprovided with-:locking dogs 3511,1 t5V which extend into the casting 3 through -Vsuitable openings 36a, 36b',fand cooperate jwith suitablev apparatus forfl'o'cki'ng the switch. locking Aapparatus.forms'no'part of our'present invention, and 4is described "detail, nfthe' previously re `ferred to Coleman Patent No. 1,791,799.

Y The switch operating apparatus also'comprises a circuit controller, .B'forfcontrolling signals or 'other traitlc governing devices in accordance with the positions of the vswitch.operatedby theap'- paratus; vThis :circuiti controller isY located in the' compartment 2l? ofthe casting 2; and as here shown comprises lthree terminaly boards 39,439* and 39h secured tothe bottom ofzthe compartment 2b.` in parallel spaced f relation. l#Attached :toV the central terminal fboard'39l is a. .iirstset'of-resilient contact iingers 46e, andla second Aset ofvrcsilient Acontact lingers Mib.'A AEach lngerfllcooperates at its free endv with a pair of iixed. contact fingers 4 le, .42e mounted onthe terminal board 39, while Veach'finger 4|)b cooperates 'at its freeend with a pair of fixed Contactfingers'41' 42?i mounted on the terminal board 39.1. The. resilientfcontact fingers 40, 401 are moved'intoa'nd out'of engagement with .theV associated xed' contact fingers? by means of blocksc43e', 4301 'insulating material l which aremounted for-longitudinal sliding movementbetween the central terminal board and the outer terminal boards 39EL and 3sbfrespectively.

The blocks 433 brarel, providedY withipairs.l of vertically .extending pins 44a', 44b for engagerrient with the opposite sides of each of the' associated contact fingers 4l)EL and v4u",'respectively/g.and are moved longitudinally by `vmeans of a pair of bell crank levers 4511,;45". These levers'are pivotally mounted-on. upstanding pins 46, 46h secured vto the bearing plate"22,ad tl1e.arms4l9,y 41b'of these levers are connected lwith the-blocks 43, 43b by meansof links 48a, 48h." The otherarms 49a, 49.b of the leversli, 45?#f are provided with rollers 5011,"50Pifor engagementwith a cam 5l which is xedtothefupper end of'the jackshaft' I9, and which is provided with anotch 52.V The arms 49a, 49b of theV levers :are connectedV by means ofV a coil springj53 so .asl to'normally bias the arms'49e,'4.9b"of these-.levers toward each engagment with the cam 5L'.V i

'rheparts are so cmstructeanso proporother and the vrollers 50., 50'? carried'. therebyA into `f `It-is occasionallyA desirable to operate of its travel toward its right-hand position shown 3, the cam 5I'has been rotated to its extreme counter-clockwise position in which the .notch 52 therein registers with the roller 50H of the bell crank lever 45a. This permits the lever 45a' to swing ina counter-clockwise direction and causes engagement ofthe resilient contact ngers 41a. During these movements of the parts, the high portion of the cam 5| maintains the bell crank lever V45b a position in which the resil- 'ientcontact-ngerslb are in engagement with their cooperating fixed contact 'ngers 4U.

When the piston llia moves to the left, however, the camV 5| is rotated inV a clockwise direction. Atthev beginning of this movement the roller 5|!a is rst forced outwardly from engagement with'- the notchV 5,2 which causes the bell crank vlever1l5l tot swing about its pivotin a clockwise direction. This causes the resilient contact ngers Neto move out of engagement with the Vassociatedxed contact fingers 4tay and into engagement with the associated xed contact nngers 42a. -When the piston reaches the limit of its movement tothe right,fthe` cam 5l has been rotated' to a position in whichV the notch 52v registers with the roller Sb ofv the bell crank 'lever 45b.1 Thispermits the Vbell crank lever 45b tofswingA about its pivot ina clockwise direction and causev the resilient contact fingers 40b to Vmove out of engagement with the associated iixed contact iingers Mb and into engagement with the associated fixed contact ngers 42h. It will be :noted that, by reason of the fact that there is but a single notch'52 in the cam 5l, the levers 4512-45b operate in succession and when one of these levers occupies its innermost position, the other lever is in its outermostl position. As a re sult,icertain of the contacts controlled by one of theleversASe, 45b are openedand others closed,

at the beginningof the movement of the mechanism in eitherdirection, but the contacts con- Atrolled'bythe other lever are not disturbed until the movements of the parts terminate. t

the switch `vmanually and independently Yof the uid pressure mechanism. At such times it is desirable Vto disconnect thecylinders 13B, I3b iromthe pipes 2895128?? to insure that the fluid pressure mecha nism will not beoperated during this manual operation; and resultv in possible injury to the 'operator'. Withy apparatus embodying our invention, one formof which we will now describe, it 'i's'impossible'to actuate the switch manually as 'longjasthe cylinders are in communicationV with the pipes 28,, V28h, and conversely, it is impossible to operatethe switch by fluid pressure while it is in condition to 'be operated manually.

.This apparatus, as hereA shown, comprises a -gearfwheel 54 (see Figs. 1 and`4)A which issecured to the'upper face of the gear wheel I8, and which .is-adapted to be rotated manually by meansv of a'vpini'on 55 fixed to the lower end of a shaft 5 5 which is provided at its upper endwith a crank Vhandle v5l. This'pin'ion is adapted to be inserted into the compartment 2u of the casting "12 through an aperture 58 provided in the'cover .l l, through a' bearing 59 formed on the plate 22, and into intermeshing engagement witlrthe gear wheel 54. Thelower end of the pinion 55 is provided with an'axially-dispose'd gudgeon 60 for `rotatable engagement with aV step bearing or rsea'tlif :formed in the housing so as to main- 'tain the pinion in intermeshin'g engagement with f gear wheel 54 vof the manuallyeoperated-device.

and prevents thev pinion 55 from `being insertedv as long as the rod 62 occupies'this position. The

' fouterVY end of the-rod v62 is pivotallyconnected by meansof a link 65 with aff-shapedimember liliV Whichisformed with sockets at ea;c`:h`er`1d"'for.en-V`V ga'gement `with the squared conro'nting* 'ends Ela', 6lb of thevalves 29a,' 29b. Y The member 66 'is also provided with a socket 58 adaptedftoreceive `a removable operating-leversuch l'as the crank tablished betweenthef pressure supply pipes 28a', '28bifand the interiorgf'of;the-cylinders 13a.; I3b,

'the rod`62 completely obstructsthefopening in the bearing 59,V thereby rendering` it *impossible for the pinion "55 tobe-v insertedin order'to oper` ate the switch manually. j"However, if it-"isdesiredf to operate the switch by meanso'f the pin-.

' and the va1ves29a. and 29b can then beerestoredy to their .fluid' on` positions in *the manner.v pre'-A ionf55, a lever is insertedin the socket 58 andthe fjmembersli and the-valves 29a, Zare turned to`A the positions shown in Fig. 4, in which positions communication between theLiiud pressure supply and thelinteriors vofthe"c :ylinders 13a, 13b is'interrupted, and 'in which communication is 'established between the cylinders and thejouteratmos'- v`phere through the vent plugs 3ll%, 38h. When the memberl 65 is thuis' operated, vthe rod 52 is withdrawn longitudinally throughthe apertures v 54 in the bearing 59to the retracted position illustratedin Fig. 4, in which it no Alonger prevents access Ythrough theopeningin this bearingj j This permits the pinion 55jto b e inserted `through the bearing 5S in order tomanually operatejthe-gear 54 and thepartsfconnected therewith. f

viously referredto lock unit L comprises a, casing Wmade up oftwo separate castings v'wel andjltlb e secured together by. means of screws :'llg, The' castings 1m is formed with embalar portion `12 which projectsthrough a; hole 13 Vin `the side of 'the casting 2,11and which is' eiteriorly-v screw; threaded at its inner end for thereceptionfof a suitable nut.;'l4 by meansof-which the entirey lock unit is secured tothe casting 2.1 The'hole aligned holes slidably'receive the `previously,de scribed rod 62. A cylinder lockjfl is securedfby means of screws 11 withina bossllfiormed theeouter' side of the casting183,"andthe inner Yend of thebarrel VVoffthis lock carries aecam 1 9 :which cooperates with a lateral projection. 88

krod U32. A springlis interposed-between; the

Vupper side vv'of Vvthecastingf'lllb and theflocking dog 8|,and constantly biases the locking dog Sto the `properposition'to :enter the notch 83..;y The `notch '83 is so "disposed in the rod 62, andthe f yparts are so proportionedthat this notchI will align with the lockingfdog when` and only when the valves 29a' and 29b occupythepostionsin zooms-oo Ywhich 'theyere 'Shown iiirigfiitwiiieii 4positioiieiwe Y` -wll hereinafterireferto'fas fluidioilpositions;`A f,

` With the lockl .unitL' constructed inethe'man vner just describedwhen thelockrb'arrel roccupies .thekpositionin which'it is shown in the drawingsf'.

which'position is its normal position,` theeanxl isoutof eiigegementwithy thefprojeotiono'on' the 'locking dog 8|, and'understhse conditions,v

'if ,the valves 29,EL and v2!)b are moved toward-their fiiuid off?? positions, thespring s4 assisted bv grav,-A

which itzentersthe notch-83 inthe vrod 62 slight- 1y before theendof rod 6 2 clears ihegbeer'ing 5s A in' 'plate 22,1th`uslocking thevalvesin their :.iuid` 3. i -offpositions'. After the'valves have once been locked in'their fuidoi positionsin this man-v i'o' afi' ity, willV rotate the locking dog to. theposition ina ner,'itis necessary, beforetheyfcan'be subsequente- 1y restored to theirglffluidonfpositionstoinsert Y the key in thelockr 16, and rotate thexlock bar rel through anangleiof 'approximately 180 .in ya n clockwise direction, "as viewedin/Fig. 5.4`

rotation of the lock barrel, of course,- rotateslthe cani V'I9 through raf corresponding 'angl'e, thereby Y 1 Acausing the highportion 19a ofthe cam vI lljto move i.' into engagementwith the projection; 8|)k on ,the lockingdog 8 |,`which raises the lockingdog toffA van upper position in Vwhich its lower edge isi clear of the notch" 483. `The rodi62.=is then freeto-ini'ove',

viously'described. Thel key for theA lock l1li Vcani- ,not be removed from the lock, however, luntil the lock barrelhasbeen restored'toits normal-'poe f J Y sition.V .-1. The reference character 85 .designates ia' Ygrav# ity latchlwhich is provided "for ithe purposezof preventingaccidental movement of the' valves Q28* 1 `'and'Zllaway from their.; fluidon positions. 'Ihislatch is pivotallyattached atpone end tofthe i VlinkV 65, and is providedV at? the other' .endyvith a1 i latch-surface 85a ,whichewhenf the parts .:arexin their nuid one positions. andtneilatoiifisain its'Y .normal position'as shown in Fig. 1, engages? the headfof` abolt 86 comprising one vvof thebolts whichfastens the cylinder head 1 4@ tothe cast*- ing I.. vIt is obvious that when'the latch surface 85a isiengagingthe bo'lt86', accidental movement of the link 65 toward the left, and hence of the valves 29a and l '29b'away'from their fluid on po- I sitionsis prevented. The Vlatchisbiased-to-its normal positongbygravity. fFormed initheY latch 85 intermediateV its ends isa transversewhole'8517` l whicliali'gns -Witha similar 'hole' 81 inthe link 65V when` the latch ,occupies its normal -gposltiomfaThe two holes 85a and'81. are adapted to receive a suitablelocking device such as a cotterrpin," andV itV will be apparent that when a cotter pin is passed through thesefholes; the. latch-an-djV associated parts will be' Vsecured in the 4positions shou'inin'-` 4Fig.'v 1. Provided on the. left-hand end vol." thev latch ssfdireetiyV above theieten su'rfeee ase-is aprojecting finger grip lug 85c by means of which the latch may be'raised-to a-position'in which the cooperates with the headfof 'the bolt 86 to prevent the valves` 29?l and 29b'fro1nebeing moved 'l theiriuid off positions@ 'I-'helatch is further vprovided. with; a horizontal rlb' 85f which, when 'the latchvhas beenraised.- far enough topermit35775V i the latchsurfac'e 85i to clear the head of the bolt 86 and the link65 l'iasfbeenv .moved toward the lleft far enough to move. the `latch surface .85 past-the head of the bolt, rides on the edge of the For reasons which are obvious, vit is desirable thatthe aperture :58 in the cover'.|| should be,

tightly. closed at all times except when,A pinion 55 is in placel for. manual operation of the switch,

and orthe purpose of `accomplishing this def` sirable'result, we provide an auxiliary cover 88 which is constantly biased to a closed position in amanner which-we willnow describe.. As

best seen in Figs. 1, v8 and'Q, the auxiliary cover 88 is secured to one horizontalleg. 89a of a-Uf shaped bracket 89, .the other leg 89h ofjwhich is securedtooneend of anarm 99 which is loosely pivotedV at its opposite endonastud bolt 9| 'secured to the underside of the cover I. Formed on the right-hand side Aof the arm 90 as viewed in ,Fig/8 vis a laterally .projecting lug` 92,' and stretched between this lug and a stud 93 secured to .the'cover f|| is a coil spring 94 which biases the arm 99,"together with the U-shaped bracket 89. and .auxiliary cover 88, tothe proper .angular position relative to ythe cover to close the aperture 58, .the parts being stopped'sin their proper positions by engagement of the closed side of the lU-shaped bracket Ywith the side of the aperture. .The stud bolt 9|V about which the. arm 99 pivots is considerably longer than the thickness Vofthe arm, and disposed on this bolt between .thehead of the bolt andthe underside of thev .arm is' a ycompressed coil spring 9,5 which con- 'sta'ntly` exertsan upwardforce on therighthandzend of' the' arm. 'vThis upward force is conlvertedinto azdo-wnward forceV atmthe'left-hand .endof thearmyby means of a depending rib 96 (seeFig. I) on the VYcover about which rib the arm isfadaptedito pivotintermediate its ends.

yIt will be seen, therefore, .that the auxiliary cover horizontal po-k is constantly.V biased 'to the proper sition to. close the aperture 58.: A finger grip lug 91'is provided on the .left-hand side of the auxiliary cover, asviewed in Fig.` 8, andwhen it is desiredto insert the pinion 55 through the aperture'58, ,thev auxiliary cover is grasped by means of vthis finger lug and raised slightly,` after which'it. is rotated about, theV studbolt Y9| as a center through an angle of approximately" or;40 in the direction of the arrowshown-on the cover. [The pinionr55 is then inserted through theaperture and the cover is released., -When this isdone,`V` the springggdwill rotate the cover 8G, inthe direction. opposite toy that indicated by' the arrow until its lower sider as Viewed in Fig. 8 rests against the sideofthe pinion shaft. Theparts are" so proportioned that when the cover isin 'this latter position, it will vnot inter'- ffere with the hand operation of the apparatus.

Uponzremoval of the pinion- 55 from the aperture-58, the springsQl and 95 operate in turn to swing the cover .to its closed position in which it is. shownin the drawings. y

f A further feature of our invention consists in novel means vfor operating Vvthe circuit controller B simultaneously with themovernent ofthe valves 29*I and 29b to their f fluid off positions to provide an indicationgthatjthe movement isbeing .reniered, ine1s9iive. farv poweroperation- ...As here underside of the rod 62.

shown, this means comprises a motion plate 98' which isv slidably mounted on a step bearing 99formed on the upper side of thecaniEl, and which is guided by a rod |99. One end of the rod IBB-is secured to the right-hand side of the motion plate, and the other end of this rod projects into a guideway formed in an upstanding projection |02 provided on the bearing plate 22. f The motion plate 98 is adapted to be moved between a righthand extreme position in which itris shown in Fig. 1 and a left-hand extreme position in projecting cams |03a and |93b which cooperate with the rollers |)a and 59, respectively, on the arms .492. and 49h of the levers Eiland 45h in such manner'that as soon( as the inotion'plate is moved away from the right-hand extreme position shown in Fig. 2, the roller 5. which then occupiesthe notch 5?. inthe cam 5| will be forced out of this notch, thus ',operating'the contacts controlled by the associatedrocker arrnl in the same manner aswhen the roller'is forced out of Athe notchl 52 during power yoperation "of the apparatus. Forexarnple, as shown in the drawings, therroller 50a on the arm 49a of the lever Ma is -*in .the notch 5,2 in the motion plante` 5|, so that the contacts 46c- 4W ofcircuit controller B are closed and thefcontactsddza are open. Ii,

now, the motion plate y9|! is `moved toward the engage the vfixed contact ngers 42a, thereby opening thecontactsA l40s- 4W and closing the contacts 40e-#421% 'A spring |94 surrounds the.

rod lbetween the projection |2 onthe bearing plate`22 and the right-hand side of the motion plate 98, and constantly-biases the motion plate toward its extreme Yleft-hand position.

' A latch piece .|05 (seeFig. 10) is pivotally attached atone end to the left-hand side of the motion plate 98, and this latch pieceis provided with anintegral upstanding rib |66 which c0- -operates with the end of the rod 62 to at times hold themotion plate in the extreme position shown in opposition to the bias of the spring |04 as-will be more .fully described presently. The latch piece'- |05 is also provided'with two rollers |01 and |||8,the one of which |58 is disposed :above anda little to the left of the other roller |01; The roller |01 `cooperates/with afcarn |09 formed on the bearing plate 22. while the roller |98 cooperates with'a notch H0 provided in the The parts are so proportioned that when the valves 29'and 291 are in their fluid on positions,therod 62 will engage the rib |95 on the llatch piece |05 and will "hold'the' motion plate in thev positionsV shown. When the motion plate occupies this position, the cams H33a and 03h are so positioned with respect to the associated rollers 5|)a and 501 that these cams will not interfere with the normal operation .ofv the circuit controller. Furthermord'when'the motion plate occupies the positionv shown, the roller |01 `is in engagement with the cam |09 and holds the latch piece |05 in a position in which the roller |98 enters the notch V| lo .inr the mi' e2, so that the latch piece is then operzratively connected withthe rod 62.

which it is `shown in Fig. 4, and isV 'provided at its opposite sides with two laterally claim is:

treme;n511119@fvelnemschanism'forwntrolli the,admissionoililuidtosaid uidpressureoperf' We' wjilinow assume Ythaif ,t1fief; member 66 is.'

Voperated to move the valves 2Q, and 29b-froxinj their ffsuid on positions to their ffiuid offiypsi'-j tons. This movement of the vmember 66 moves the rod 62 `toward theleft in the. mannextpre-` viously described, fand since roller I 08 is nowheld within the notch H0; inthe rod ,62 byfengagfef` ment of'roller |01 with cam |09, it will bejap-` parent thatj thisfmovement ofithe rod 6 2 toward theleft will move the ymotion plate 90y along with the rod, until the motion plate has been movedVv tothe. position in which 'the roller ,|01l moves outl Y ofengagement with the cam 109. .Whenethis happens,l the roller `l 00 moves' out` lof f the Y notch:

I`|0in the rod 62, therebydisconnectingxthe rod4 62 from the motion' plate; y'The' parts vare soiprofA` portioned that Vwhen the rod becomesgdisconnected fromthe motion plate,\;the motionplate f will have been 'moved .to thexextreme position i'nY l and motion plate 98 "tol move toward r the right,

'forced out of thsnotch,"thereby' operating-the. li; contacts of v circuitfcontrollervB. to ra positioncto.Y

; which it is shown inV Fig.4',*and-asf.was previously :pointed out', `when thev motion platey oc,- cupiesthis position; the roller 50 which 'previously occupied the notch` 52k ingthermotion plate 5|fis indicate 'that .the Vapparatus has -been rendered ineiective 'for power yoperation'. After themotion plate has/.been moved'tov the"extreme positionV shown in'Fig.` 4, thespringlM operates to main-v tain it in this position. IIherod'62 n'owbeing disconnected'from'the motion: plate may be with; drawnfrom the bearing 591in`the manner pre-V viouslydescribedto permit the pinionjS-to-vbe in'serted'in place for hand operation. w

stored to their uidf on` position, the rod Slis again projected across the opening in the bearing 58i and into engagerneni'fw'ithA the upstandingribll The engager'nentY of the rod' SZi-with the rib I 06 causesthelatch piece andV as the latch piece moves tovrard1thef'right,`

the roller '|01 ridesv uponto the camjl09-lwhich restores the latchV piece to the positions shovvnfinr i; Fig. 1',- thus causing the 'roller |08Y to reentef-.the'

notch I I0'in 'the rod 62; 'I'fhe' movement of the motion platey 98 toward the right movesthe cams |03a and |03b 'out of engagement vwith the asso-1V ciated rollers 50and 50i on the levers 41B 'aardy 41h; and thus permits therouer 5o which' islthen inl` alignment lwith thenotch 5,2 in the cam 5| to re-v enter4 this notch, thereby-restoring' the contacts of circuit controller, B to their vproper positions for power Voperationfof the switch.v

It Should be pointed out thatwhenithe :notion 5 plate 198 and latch piece '1105 are in the Vpositions which they occupy when theapparatus isfin con v dition 'for Vhand' operation as shown in Fig. ji, the latch piece 'is in such c l'osepronimity to theadjae" Cem Side 0f #he bearingY 59 'that' any .upward movement Of the latchpieceL 105%, due to vibratinn,

is prevented.V

Althoughv we have hereinjsnown and described only one' form `of railway-switch voperatingap` paratus embodying our` invention, it is understoodi that various changes and modifications may'be l made therein within 'thescopefofthe :appended ciaims without departing rfrmfxthe spirit and' scope-ofouriinvention- Y i' Having thus described ourinventiomwhatwe z1..Railway vswitch operating vapparatus comt prising aV casing,ta switch actuating shaft'jour-v naied` in said casing, iiuidwpressiireV` operated' t' means for actuating said .shaftibetween twofex- @ted-means 'sfaievawe mechanism navinea'nrstt vented-a cem lisecitl'ied, t9; Seid switch 1.a.'ti1eti1k., She-ita 'm/Qtin'platemovable between a rsiandj af second vpositionmeans for movingfsaid Vmotiony platetoits first position or'itssecond positionA according` 3 5, said valve mechanism is ,moved-to troller controlled by said.'canfiandsaidfmo on sxivit c1 1 .opeigttilig apparatus .comfV prisme-a Casing, Switch atuating' shiftiouffY plate, l

.V12-ARailway nale@` 'in Said easing; Huidv :pressure dneratd means far actuatilisgsaidoshatbetneen twoxf* treme, positbnsf-val-ve mechanism fonicontolhjg.

ated neem-assis, `valverirles=ln-r1is 1141 having, a, 'firSt1*- positionfjinlwhihiuid can be admitted to, said 1- ressure-operatedgmeans andrafsecondposi-j Y, tionl in which liuidafcnnnot. .be admitted t9 Said 1 pressure, oneratd'means fa Cam SeQurd'to saidlswitchiactuatme Asluifitemotion, platerinov- Y ablenetweenairstand second. positiommans O r ,Second pfisitiotriY according fas Said. valve mechanism Y is: moved maiis. first Qrf its, Second 1 position;` and fa contact `co1 1tr o lled Vjointly by, said l motion, plate, andvsaidem andvirrangedriht Said Contact `-will abe closed; .when andbnlywhen said shaft; occupies one extremepos'ition and said-.motion plate- 9106111111255its-1irstp0si1011f e 3 3.: Railway :switch operating fappaatusj Com-' lprising a y casing; -a,tswitch; actuatingglshait n 'lour-;v naled f-in `Said vteasing, uid;` pressure.; Operated? f theadmission of fluid to said fiuidpressurepper-g ated means said valve mechanism having a rst position in which. fluidcan, be admitted to` said fluid pressure opereted` means 'and aL second -posi'- l.

tion-1in, which mnd c'annotbe admitted tos'id* able between-a Dfirstand a second position, means for-movinggY- said'v motion :plate to its `ilrstposition ors-its` second :positionfaccordingias. Vsaid: valve t fmechanismiisgmoved to its `first orits second position-,fa contact controlledl-J'Qilitli' by said motion plate and said;v cam` and sqarrangedthat Y said contactgwili be closedfwhen; and Aonly when said shaft occupies Aoneextrerne position and said motion plate Aoccupies;its first position;y and a: f' secondV contact; controlled Ajointly by Vsaid motion plate; and saidcam and so arranged j that saidl contactwill beclosed 4whenyand onlygwhen saidj shaft- :occupies: the other extreme position and said-v motion plate occupies Aits i first position.

' fluidi pressure operated means a cam securedtd t V'saidstvitchactuating-shaft, aV motion plate Ymovprising avfcasing, ;a switchgactuating shaftjourf naled :in 1 s aid casingV Vhuidl V -pressure operated Y means tor-actuating, said shaft between two ex-.

tremelms'itionsivlve mehanismlrvrcontrolling Athe .admission o f luidtosaid uid ,pressure oper,- o

for-moving said motion plate toits first position,

or itsrsecon'dpposition according as ,said4 valve mechanism is moved to its nrst'QI its isecond position, a first contact controlled' by said motion plate and said cam'in such manner that said first contact will be closed when and only' when said switch actuatin'g l i able between a first and a'nsecondposition, means f mechanism is move'dfto its first or its second s aid shaft occupies one extreme position andsaidV motionvplate'occupies its first extreme position,

a and a second contact controlled bysaid motiony plate, and saidicam in such manner thatsaid second contact will be closed when VVsaid( shaft occupies any position but said one extreme positionor when said motion plate occupies any position but itsfirst position. i

5. Railway switch operating apparatus com- Vprising'a casing, Aa switch actuating shaftjour- *Y v fluid pressureoperatedv Vmeans Vfor actuating said shaft-between twoex-'f n'aled inY said casing,

t'remefpositions, valve mechanism for;controlling vthe admission'fof` fluid to said fluid pressure operated'means, said valve mechanism'having a' first position fluid pressure operated means and a second posi-` position, afirst contact controlled by said motion plate and saidcam in such manner that said 'first contactwill be closed when and only when'said shaft occupies one ex'trerne'positionand saidf motion plate occupies itsfirstposition, a second contact controlled' by said motion' plate lando'ysaid cam insuch manner that said secon'd'contact will be closedwhen and only when said shaft occupies its other Yextreme position andsaid motionplate occupies `its first position, a thirdcontact controlled bysaid cam'and 'said'` motion plate in such manner that saidV third contact will be'- come closed whenever said shaft occupies' any position but its one extreme'position or whenever said motion platey occupies anyposition but its firstrposition,V and a fourthcontact controlled by said cam and said motion plate in usuch'inanner that said fourthV contact vwilli'become closedt whenever said shaft occupies 'any'position' but its otherextreme position or "whenever said motion plate occupies anyposition butv itsirust tion; Y

t. Railway naled in said l casing,A-` i means for actuating said'shaft between Vtwo extreme positions, valve mechanism for controllingY the admission ofl fluid to said. fluid pressure operated means, Vsaid valve inechanism havingaY first position in which 'fiuid can be admitted'tosaid fluidpr'essure operated means and a'second position-'in lwhich -fluid cannotbe admitted. to said fluid pressure operated means; a cam secured to said switch actuating shaft,l a motion platemovable betv'veenA a first andfa'second position', a bearing in saidfcasing adapted -to receive 'aremovable shaft for manually operating s'aid switch actuating shaft, `a''rodmovable between-a first positionv in lwhich it V.preventssaid manually operable shaftfrom being inserted into saidbearing and a second position 7 in whichlitpermits` said manually operable shaft to be 'inserted into said bearing, means for connectingv said rcdwith said valve 'mechanism in such-manner' that jsaid rodwill'occupy its Afirst position or itsfsecond in which 'fluid can be admitted f toisaid*V means, a lcam securedtof shaft, a motion plate mov-`V switch operating appaatus :com-'- prising acasingf, a switch actuating 'shaft jourfluid VpressureVv operated agoodsoo position'according as said valve mechanism occupies its firstposition or its second position, means controlled-byv said rod for moving said motion plate to its first position or its second position according as said rod is moved to its first position or its secondposition, and a circuit controller controlled bysaid cam and said motion plate. y i

f '7.*Railway switch operating apparatus com- .prising` a casing, a switch actuating shaft journaled in said casing, nuid pressure operated meansfor actuating said shaft vbetween two extreme positions, valve mechanism for controlling the admission of 'fluid to said fluid'pressure operated means, said .valve Vmechanism having' a first' position in which fluid can be admitted to said fluid pressure operated means and a second position inzwhich fluid cannot .be admitted to said `fiuidpressure operated means, a cam secured to said switch actuatingshaft, a motionvplate movable between 'a first and a second position, a bearingin said casing adapted to receive a'removable shaft for manually operatingv said switch actuating shaft,v a rod movable between a first positionl infwhich itprevents said manually operable shaft from'being inserted into said bearing anda second position vin which it permits said manually'operable shaft to be inserted into said bearing; means forconnecting said rod with said valve mechanism in-such mannerthat said rod will occupy its first'position orvits second position according-as said valve mechanism occupies-itsl first' position' or itsV second position', means controlled by saidrod for moving said motion plate toits first position or its second position accordinggasfsaid rod is moved lto its first Vposition-or its Isecond" position, and a contact controlled jointly by said motion plate and said cam and so arranged that said contact will be closed when and only `when said shaft occupies one extreme position and said motion plate occupies its first extreme position.

8. Railway switch operating apparatus comprisingv a casing, 'a switch actuating shaft journaled in `said casing, fiuid pressure operatedy means for actuating said shaft between two extreme positions, valve mechanism for controlling the admission of fluid to said fluid pressure operated means, said valve mechanism having a first-:positionv in which fluid can be admitted to said .fluid pressure operated means and a second position in which fluid cannot be admitted to said fluid pressure operated means, a bearing in said casing adapted to receive a removable shaft for manually operating said switch actuating shaft,- arod movable between a first position in whichit prevents said manually operable shaft from -being inserted into said bearing and asecond position in which it .permits said manually operable shaft to be inserted into said bearing,

means for connecting said` rod with said valve mechanism in such manner that said rod will occupy its first position or Yits second position according as said valve mechanism occupies its first position or its vsecond position, a cam secured to said switch actuating shaft, a motion plate movable between a first position and a second position, means controlled lby said' rod for moving said motion plate to its first position or its second positionv according as'said rod is moved to its first position or its second position, a first contact controlledby said motion plate and said cam in such mannerthat said first contact will be closed when ,and 4only when said shaft occupies one extreme positionv and said motionplate occupies its-first extreme '.positiom. and a secondi contact controlled by said motion plate andsaid `camin` such-manner that saidsecond contactiwillbei`v closed 4when said shaftoccupies any' position butsaid one extreme position'orwhen said motionj f plate occupies'any position butits first position'.

9J Railway switchl operating apparat'us com-.-

prising' a casing, a.A switch; actuating. shaft journaled in said' casing, fluid pressure .operated means for actuating said shaft betweentwo eX- treme positions, valve Amechanism 'for .controlling the admission of fluid to said iiuid pressure .operj ated means, said valve mechanism having airstposition in which `fluidcan be admitted".Yto'fsa'ifdfr fluid pressure operated` means and-'asecond posi-* tion in which uid cannotlfbe 'admittedtoy fluid pressure operatedmeans, af'bearing'inzsaid;

casing adapted to receive a-removable shaft. for

manually operating. said switch actuating shafts a rod movable between a' rst position lin' whichit prevents said manuallyoperable` shaft *from being inserted into 'said"b'earingj;and' afsecond position in :which it permits saidfmanually oper? able shaft'to be'insertedinto said'bearing', means means controlled by 'said rod'for .moving said nriotioniplateV to its-.rst position or its secondv position according as 'said-rod isfrnoved toits first position or its; second position, a rfirst'contact controlled by saidr motion plate and said. cam

in such manner `that said first contact` will be,

closed when and only when said shaft: occupies one extreme position and'said motion-plate oca4 cupies its Viirst position,a second contact'comtrolled bysaid motionplate and said cam insuchmanner that (said second contact'will be closedl when and only Vwhen said shaft occupies its other extreme position andsaid motionrplate' occupies its rst. position, 4-a third contactk con` trolled by said cam and said motionplate in suchY manner that said third contact will become closed whenever said shaft occupies' vany position' but its one extreme position or whenever saidmotion' plate occupies any position but its first position, and a fourth contact' controlled by saidy cam and said motion 4plate in such'inannerl that said fourth Contact will. become closed whenever said shaft occupies any position'but its other extreme posi? tion'or'whenever said motion plateV occupies any position but its rst position;

1 l0. Railway switch operating apparatus comprising a' casing, a switch actuating.. shaft y journaled in said casing, uidpress'ure operated means foractuating said shaft between twoV ex'-` treme positions, valveznechanism for controlling the admission of iiuid to said fluid pressureoperated means, said val-ve mechanismfhaving afirst Yposition in which fluid can` beladm'itte'd to saidz uid pressure operated means 'and a'second posi-v tion in which fluid `camiot be. admitted tolsaid uid pressureV operated means, `a bearing in saidi casing .adapted to receive a removable shaft-for"rv manually operating said switch 'actuating'shart a rod movable betweena first position in whichA .it prevents said manuallyoperable shaft from being inserted intoY said bearing and asecond position in which it permits said manually opero able shaft to be inserted into said bearing, means for connecting said rod with said valve mechaprising a casing,Y

nisr in such vmanner 'that'saidrod .wm occupy its; first position or its secondposition.accordinggasi` Vsaid valve .mechanism occupiesitsj `iirstwpositiorrV oritssecondposition, a .rst camvsccured t'oJsai'di switchactuat'ng Shaft and-provided with alnotch; j

a motionjplatej'slidably mounted. on'astep bearing formed o-ns'aid 'cainj means" controlled by said' rod. for moving said *r'n'otion plate yto a firstp'osie.`v tion or, af second, position;.according-as s'aid'rod.I Vis lmoved to lits firstgposition o-rV its. second'. posi'.-v Vtion, and a circuit controller-*controlled by-Ssaid' y cam'andfsaid'motion plata;

1'1;.Railway switchpperating Yapparatus *com-'lj d switch.. actuating shaft j ournaled 1in "said casingluidgpressure lmeans for.:

Vactuating said-shaft frompneyextreme posi-g tion; to another extreme position, 1 a valve, forlv .controlling the'i admissionrvr of fluidnto` .said i uid v'pressure means,- aggearwheel fsecu'red tos; saidL f shaft; a vbearing :adaptedtoV maintain fa'l manually 1 operable. remoiable 'pinion in `operative posi-Y con'nectediwith said Valve and extending= through said. bearing-Tor obstructingfaccess to said bearzjf. ing when said -valvej .is jopen'aand `for pelrrr'iitting'v said pinion to' be mounted insaid bearingforY 1tionwith,respectito'said gean. a rodmeratively'r v the .manual operation :cf lsaid i gear. -when r.said Valveis closed'ga frst cam secured .t'ofsaid shaft:

Vand..provided. with; a1notch;}a.roller .biased intoL enter `said notchjwhen` and" only when. said shaft? .occupies said one extreme position, a circuit' 'con. troller* controlled :by said'v roller, a motion plate.

movable between arstand a' second-fpositionfa'.

cam" on said motion platefcooperatin'g with said? roller and=1eiiectivewhen 'sa-id" motionf plate isk moved toitsrst position for forcing said VrollerI out ofA the` notch, in said; first caml if'jsaidrollerf then occupies the'notch: in said iirstgcam,"and

means controlledA by' 'said i rod. forY i moving j saidv motion. plate to its second .position .orf to itsliirstv position according as saidrod..occupies the position in .which-"it.obstructs-saidy bearingpri itslv other position. Si j Y. Y I .412. Railway switchoperating apparatus' com` .Y prising a. casing; .al first bearing'formed: in thef bottomfof said casing, "abearing plate fsecured to said casing Aand'provided with la'secmd bear-iA ing Ywhichkaligns-with saidfirst bearingya'switch actuating `shaft j ournaledi,` in said` two .'bearing's,

fluid pressure actuatedmeans for rotating said? shaftv between two extreme positions? valve. `m'e ;h Y. ani'sm for controllingv the admission offluid to` said fluid pressureV operated.' means;Y said valve mechanism having af rst 'position ini whichiiiuid can be admitted to .saidfluidfpressure operatedV means and aV secondlposition'inwhich fluid can-lv 1 Ynot be admitted means'. a' third bearing'. formed `in said' bearing plate,l said third'.r bearing being adapted. 1to1 receive-avremovable'shaft for manually'opera'ting said 'switch actuating shaft;jarod having la, first;

position. in :which fit preventsy said-lremovable "shaft froin being inserted into said "third'bear-- ing/and a second positionin which it permitsV said removable shafttobe inserted into said notch, a first lcam:.secnredfto vsaid switch lactu? ating shaft, ra step bearing ,formed-jon said lfirst cam, :la ".mtionplate.-slidablyl mounted on `vsaid step bearing for l longitudinal Vmovement between a rst position and a second position, means Yfor biasing saidmotion plate to itsY second po-` sition, a second 'camrformed on said bearingl plate,v a latch piecev pivotallyattached to said Y tosaidifluid pressurefop'eratedA l motion plate, a roller secured to said latch Ypiece and adapted to engage saidV second cam when said motion plate occupies its first position but, not when saidv motion plate occupies its'se'co'n'd position, a. second rollerV secured .to saidv latch piece in such manner that it will enter the notch in said rod when said rst-roller engages said"y second cam, an upstanding ribfon ysaid latch.

piece adapted to cooperate with the. end of said rod to move said motion plate-,from its Asecondposition to its first position in response to movement of 'said rod from its second position toits first position, means for operatively connecting said rod with said valve mechanism in such'4 manner that said rod will be moved to its first position or its second position according as Vsaid valve mechanism occupies its first position or its,

second` position, vand a circuit controller con:-

trolled by. said iirst camafnd by said motion plate.

13. Railway switch operating apparatus comprising Va casing, a1 first' bearing formed in .the bottom ofl said casing, a bearingfplate 'secured to said casing and providedwitha second bearing which alignswith said rst bearing, a switch' actuating `shaft journaled in said two bearings,

fluid pressure actuated means for rotating said. VY shaft between two extreme positions, valve-rnech1 anism for controlling the admission of fluid to said fluid pressure operated means, said valve mechanism having a rst position Vin which fluid canv be admitted to said iluid pressure operated means and a second position'in which fluid cannotbe admitted to saiduid pressure operated means, a thirdbearing formed in said bearing plate, said third bearing being adapted to receive a removable vshaft for manually operating said switch actuating shaft, .a rod having arfirst position in which it .prevents said removable shaft from being inserted into said third bearing and a second position in which it permits said remov.

able shaft to be inserted into saidthird bearing, said rod being provided with a notch, a first cam secured to said ,switch actuating shaft, said rst cam being provided with a notch, two pivoted bell crank levers, two rollers one secured to. each lever in such'manner that the one roller will align with the notch in said rsrtc'am when andonly` when said switch actuating shaft occupies one extreme position, and-that the other roller will align with Ythe notch in said rst cam when and only when said switch actuating vshaft occupies the other extreme position, means for biasing said two bell crank levers to positions in which the associated roller will enter lthe notch in said cam whenever such notchjaligns Withsuch rollr, a step bearing formed on said iirst cam, a motion plate slidably Vmounted .on said step :bearing for longitudinal movement between a first position anda second position, means for biasing said motion plate to itsv second positiorna second cam formed on-said bearing plate, a latch piece pivotally attached to said motion plate, a roller secured to said latch piece and adapted to engage said second cam when said motion plate occupies its first position but not when said mo.-

tion plate occupiesits second position, a secondY roller securedto said latch piece in such manner that it enters the notch inY said r'od when said iirst roller engagessaid second cam, an upstanding rib on: said latch .piece adapted to coop-V erate with the end of said rodl to move said mo- `2,ooo, eeo. y

tionplate from its second position to its first position inrresponseY to movement of saidrrod from its second position to its rst position, means for operatively connecting said rod with said valve mechanism insuch manner that said rodwill bemoved toits first position or its second position according as said valve mechanism occupies'its first position or its second position, two cams formed onsaid motion plate and one cooperating with the roller on each bell crank lever in such manner that when said motion plate occupies its lfirst position both said cams will be VVoutiiof engagement with they associated roller but-:that when said motion plate occupies its second position both cams 4will engage the associated roller and will rotate the associated bell vcrankflever to the same position it occupies when f the Vassociated roller is forced out of the notch in said rst cam, and-contacts controlled by each bell crank lever.

.14..Railway switch operatingapparatus comprising. a casing, a switch actuating shaft `ourjnaled lin `said casing, fluid pressure actuated means'for operating said shaft; a valve having an open and a closed position and arranged to control the admission of uid pressure to said fluid'pressure actuated means, a bearing in said casing 4adapted to receive removable means for manually voperating said, shaft, a rod having a first position in which access to said bearing is prevented and a second position in which access to said/bearing is permitted, a link pivotally attached at one end to the free end of said rod, a member attached to said valve in such manner that rotation of said member operates said valve, said member being pivotally attached to the free end of. said link in such manner that said rod' will be moved to its first position or its second position according as said valve is open or closed, and a latch .pivotally attached to said link and biased by gravity to one position and provided with a latch engaging surface which when said latchoccupies said one position engages a part of said iluid pressure means and prevents accidental movement of said valve .away from its open position. f

. l5. In combination, a rod movable between two extreme4 positions and provided with a notch, a motion plate movable between two extreme positions, a cam, alatch'piece pivotally attached to said motion plate and provided with a first roller which-is adapted to engage said cam when said motionplateoccupies one extreme positionV but not when said motion plate occupies the other extreme position, a second roller secured to said latch piece in such manner that it will enter the notch in Ysaid rod whenv said rod occupies one extreme position and said 'rst roller is engaging `said cam, whereby said motion plate may be 

